Spread of current from monopolar stimulation of the lateral hypothalamus.

the boundary of a system. The characteristics of the threshold bared of insulation. The effects of stimulation were tested gradients suggest that, with intensities on the order of 25 pa, the for 5 days with the electrode at each lateral hypothalamic effective spread of current from small monopolar electrodes may site; each week the electrodes were moved approximately be as little as l/8 mm. The changes in threshold with electrode 34 mm further toward the base of the hypothalamus. movement also suggest that the lateral hypothalamic eating and The details of the stimulation procedure are given elsedrinking systems are homogeneous, have distinct boundaries, and are bordered on the ventral aspect by systems that do not mediate where (8). The important data for the present discussion are